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ceph: fix reading inline data when i_size > PAGE_SIZE 

when inode has inline data but its size > PAGE_SIZE (it was truncated
to larger size), previous direct read code return -EIO. This patch adds
code to return zeros for data whose offset > PAGE_SIZE.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2015-01-10 11:43:12 +08:00 committed by Ilya Dryomov
parent 86d8f67b26
commit fcc02d2a03
2 changed files with 26 additions and 15 deletions
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19
fs/ceph/addr.c
View File

@ -196,17 +196,22 @@ static int readpage_nounlock(struct file *filp, struct page *page)
u64 len = PAGE_CACHE_SIZE;
if (off >= i_size_read(inode)) {
zero_user_segment(page, err, PAGE_CACHE_SIZE);
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
return 0;
}
/*
* Uptodate inline data should have been added into page cache
* while getting Fcr caps.
*/
if (ci->i_inline_version != CEPH_INLINE_NONE)
return -EINVAL;
if (ci->i_inline_version != CEPH_INLINE_NONE) {
/*
* Uptodate inline data should have been added
* into page cache while getting Fcr caps.
*/
if (off == 0)
return -EINVAL;
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
return 0;
}
err = ceph_readpage_from_fscache(inode, page);
if (err == 0)

22
fs/ceph/file.c
View File

@ -879,28 +879,34 @@ again:
i_size = i_size_read(inode);
if (retry_op == READ_INLINE) {
/* does not support inline data > PAGE_SIZE */
if (i_size > PAGE_CACHE_SIZE) {
ret = -EIO;
} else if (iocb->ki_pos < i_size) {
BUG_ON(ret > 0 || read > 0);
if (iocb->ki_pos < i_size &&
iocb->ki_pos < PAGE_CACHE_SIZE) {
loff_t end = min_t(loff_t, i_size,
iocb->ki_pos + len);
end = min_t(loff_t, end, PAGE_CACHE_SIZE);
if (statret < end)
zero_user_segment(page, statret, end);
ret = copy_page_to_iter(page,
iocb->ki_pos & ~PAGE_MASK,
end - iocb->ki_pos, to);
iocb->ki_pos += ret;
} else {
ret = 0;
read += ret;
}
if (iocb->ki_pos < i_size && read < len) {
size_t zlen = min_t(size_t, len - read,
i_size - iocb->ki_pos);
ret = iov_iter_zero(zlen, to);
iocb->ki_pos += ret;
read += ret;
}
__free_pages(page, 0);
return ret;
return read;
}
/* hit EOF or hole? */
if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
ret < len) {
ret < len) {
dout("sync_read hit hole, ppos %lld < size %lld"
", reading more\n", iocb->ki_pos,
inode->i_size);